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test_firewall.py
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import mock
import pytest
from paasta_tools import firewall
from paasta_tools import iptables
from paasta_tools.utils import DEFAULT_SOA_DIR
from paasta_tools.utils import NoConfigurationForServiceError
EMPTY_RULE = iptables.Rule(
protocol="ip",
src="0.0.0.0/0.0.0.0",
dst="0.0.0.0/0.0.0.0",
target=None,
matches=(),
target_parameters=(),
)
@pytest.fixture
def service_group():
return firewall.ServiceGroup(service="my_cool_service", instance="web")
@pytest.yield_fixture
def mock_get_running_mesos_docker_containers():
with mock.patch.object(
firewall,
"get_running_mesos_docker_containers",
autospec=True,
return_value=[
{
"HostConfig": {"NetworkMode": "bridge"},
"Labels": {
"paasta_service": "myservice",
"paasta_instance": "hassecurity",
},
"NetworkSettings": {
"Networks": {
"bridge": {
"MacAddress": "02:42:a9:fe:00:0a",
"IPAddress": "1.1.1.1",
}
}
},
},
{
"HostConfig": {"NetworkMode": "bridge"},
"Labels": {
"paasta_service": "myservice",
"paasta_instance": "hassecurity2",
},
"NetworkSettings": {
"Networks": {
"bridge": {
"MacAddress": "02:42:a9:fe:00:0b",
"IPAddress": "2.2.2.2",
}
}
},
},
# host networking
{
"HostConfig": {"NetworkMode": "host"},
"Labels": {"paasta_service": "myservice", "paasta_instance": "batch"},
},
# no labels
{"HostConfig": {"NetworkMode": "bridge"}, "Labels": {}},
],
):
yield
@pytest.mark.usefixtures("mock_get_running_mesos_docker_containers")
def test_services_running_here():
assert tuple(firewall.services_running_here()) == (
("myservice", "hassecurity", "02:42:a9:fe:00:0a", "1.1.1.1"),
("myservice", "hassecurity2", "02:42:a9:fe:00:0b", "2.2.2.2"),
)
@pytest.yield_fixture
def mock_services_running_here():
with mock.patch.object(
firewall,
"services_running_here",
autospec=True,
side_effect=lambda: iter(
(
("example_happyhour", "main", "02:42:a9:fe:00:00", "1.1.1.1"),
("example_happyhour", "main", "02:42:a9:fe:00:01", "2.2.2.2"),
("example_happyhour", "batch", "02:42:a9:fe:00:02", "3.3.3.3"),
("my_cool_service", "web", "02:42:a9:fe:00:03", "4.4.4.4"),
("my_cool_service", "web", "02:42:a9:fe:00:04", "5.5.5.5"),
)
),
):
yield
def test_service_group_chain_name(service_group):
"""The chain name must be stable, unique, and short."""
assert service_group.chain_name == "PAASTA.my_cool_se.f031797563"
assert len(service_group.chain_name) <= 28
@pytest.yield_fixture
def mock_service_config():
with mock.patch.object(
firewall, "get_instance_config", autospec=True
) as mock_instance_config, mock.patch.object(
firewall,
"get_all_namespaces_for_service",
autospec=True,
return_value={"example_happyhour.main": {"proxy_port": "20000"}},
), mock.patch.object(
firewall, "load_system_paasta_config", autospec=True
) as mock_system_paasta_config, mock.patch.object(
firewall, "_synapse_backends", autospec=True
) as mock_synapse_backends:
mock_system_paasta_config.return_value.get_cluster.return_value = "mycluster"
mock_instance_config.return_value = mock.Mock()
mock_instance_config.return_value.get_dependencies.return_value = [
{"well-known": "internet"},
{"smartstack": "example_happyhour.main"},
{"cidr": "169.229.226.0/24"},
{"cidr": "8.8.8.8", "port": 53},
{"cidr": "8.8.4.4", "port": "1024:65535"},
]
mock_instance_config.return_value.get_outbound_firewall.return_value = "monitor"
mock_synapse_backends.return_value = [
{"host": "1.2.3.4", "port": 123},
{"host": "5.6.7.8", "port": 567},
]
yield mock_instance_config
def test_service_group_rules_no_dependencies(mock_service_config, service_group):
mock_service_config.return_value.get_dependencies.return_value = None
assert service_group.get_rules(
DEFAULT_SOA_DIR, firewall.DEFAULT_SYNAPSE_SERVICE_DIR
) == (
EMPTY_RULE._replace(
target="LOG",
matches=(("limit", (("limit", ("1/sec",)), ("limit-burst", ("1",)))),),
target_parameters=(("log-prefix", ("paasta.my_cool_service ",)),),
),
EMPTY_RULE._replace(target="PAASTA-COMMON"),
)
def test_service_group_rules_monitor(mock_service_config, service_group):
assert service_group.get_rules(
DEFAULT_SOA_DIR, firewall.DEFAULT_SYNAPSE_SERVICE_DIR
) == (
EMPTY_RULE._replace(
target="LOG",
matches=(("limit", (("limit", ("1/sec",)), ("limit-burst", ("1",)))),),
target_parameters=(("log-prefix", ("paasta.my_cool_service ",)),),
),
EMPTY_RULE._replace(target="PAASTA-COMMON"),
EMPTY_RULE._replace(target="PAASTA-INTERNET"),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="1.2.3.4/255.255.255.255",
matches=(
("comment", (("comment", ("backend example_happyhour.main",)),)),
("tcp", (("dport", ("123",)),)),
),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="5.6.7.8/255.255.255.255",
matches=(
("comment", (("comment", ("backend example_happyhour.main",)),)),
("tcp", (("dport", ("567",)),)),
),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="169.254.255.254/255.255.255.255",
matches=(
("comment", (("comment", ("proxy_port example_happyhour.main",)),)),
("tcp", (("dport", ("20000",)),)),
),
),
EMPTY_RULE._replace(
protocol="ip",
target="ACCEPT",
dst="169.229.226.0/255.255.255.0",
matches=(("comment", (("comment", ("allow 169.229.226.0/24:*",)),)),),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="8.8.8.8/255.255.255.255",
matches=(
("comment", (("comment", ("allow 8.8.8.8/32:53",)),)),
("tcp", (("dport", ("53",)),)),
),
),
EMPTY_RULE._replace(
protocol="udp",
target="ACCEPT",
dst="8.8.8.8/255.255.255.255",
matches=(
("comment", (("comment", ("allow 8.8.8.8/32:53",)),)),
("udp", (("dport", ("53",)),)),
),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="8.8.4.4/255.255.255.255",
matches=(
("comment", (("comment", ("allow 8.8.4.4/32:1024:65535",)),)),
("tcp", (("dport", ("1024:65535",)),)),
),
),
EMPTY_RULE._replace(
protocol="udp",
target="ACCEPT",
dst="8.8.4.4/255.255.255.255",
matches=(
("comment", (("comment", ("allow 8.8.4.4/32:1024:65535",)),)),
("udp", (("dport", ("1024:65535",)),)),
),
),
)
def test_service_group_rules_block(mock_service_config, service_group):
mock_service_config.return_value.get_outbound_firewall.return_value = "block"
assert service_group.get_rules(
DEFAULT_SOA_DIR, firewall.DEFAULT_SYNAPSE_SERVICE_DIR
) == (
EMPTY_RULE._replace(
target="REJECT",
matches=(),
target_parameters=(("reject-with", ("icmp-port-unreachable",)),),
),
EMPTY_RULE._replace(
target="LOG",
matches=(("limit", (("limit", ("1/sec",)), ("limit-burst", ("1",)))),),
target_parameters=(("log-prefix", ("paasta.my_cool_service ",)),),
),
EMPTY_RULE._replace(target="PAASTA-COMMON"),
EMPTY_RULE._replace(target="PAASTA-INTERNET"),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="1.2.3.4/255.255.255.255",
matches=(
("comment", (("comment", ("backend example_happyhour.main",)),)),
("tcp", (("dport", ("123",)),)),
),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="5.6.7.8/255.255.255.255",
matches=(
("comment", (("comment", ("backend example_happyhour.main",)),)),
("tcp", (("dport", ("567",)),)),
),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="169.254.255.254/255.255.255.255",
matches=(
("comment", (("comment", ("proxy_port example_happyhour.main",)),)),
("tcp", (("dport", ("20000",)),)),
),
),
EMPTY_RULE._replace(
protocol="ip",
target="ACCEPT",
dst="169.229.226.0/255.255.255.0",
matches=(("comment", (("comment", ("allow 169.229.226.0/24:*",)),)),),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="8.8.8.8/255.255.255.255",
matches=(
("comment", (("comment", ("allow 8.8.8.8/32:53",)),)),
("tcp", (("dport", ("53",)),)),
),
),
EMPTY_RULE._replace(
protocol="udp",
target="ACCEPT",
dst="8.8.8.8/255.255.255.255",
matches=(
("comment", (("comment", ("allow 8.8.8.8/32:53",)),)),
("udp", (("dport", ("53",)),)),
),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="8.8.4.4/255.255.255.255",
matches=(
("comment", (("comment", ("allow 8.8.4.4/32:1024:65535",)),)),
("tcp", (("dport", ("1024:65535",)),)),
),
),
EMPTY_RULE._replace(
protocol="udp",
target="ACCEPT",
dst="8.8.4.4/255.255.255.255",
matches=(
("comment", (("comment", ("allow 8.8.4.4/32:1024:65535",)),)),
("udp", (("dport", ("1024:65535",)),)),
),
),
)
def test_service_group_rules_synapse_backend_error(mock_service_config, service_group):
mock_service_config.return_value.get_dependencies.return_value = [
{"smartstack": "example_happyhour.main"}
]
firewall._synapse_backends.side_effect = IOError("Error loading file")
assert service_group.get_rules(
DEFAULT_SOA_DIR, firewall.DEFAULT_SYNAPSE_SERVICE_DIR
) == (
EMPTY_RULE._replace(
target="LOG",
matches=(("limit", (("limit", ("1/sec",)), ("limit-burst", ("1",)))),),
target_parameters=(("log-prefix", ("paasta.my_cool_service ",)),),
),
EMPTY_RULE._replace(target="PAASTA-COMMON"),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="169.254.255.254/255.255.255.255",
matches=(
("comment", (("comment", ("proxy_port example_happyhour.main",)),)),
("tcp", (("dport", ("20000",)),)),
),
),
)
def test_service_group_rules_empty_when_invalid_instance_type(
service_group, mock_service_config
):
with mock.patch.object(
firewall, "get_instance_config", side_effect=NotImplementedError()
):
assert (
service_group.get_rules(
DEFAULT_SOA_DIR, firewall.DEFAULT_SYNAPSE_SERVICE_DIR
)
== ()
)
def test_service_group_rules_empty_when_service_is_deleted(
service_group, mock_service_config
):
"""A deleted service which still has running containers shouldn't cause exceptions."""
with mock.patch.object(
firewall, "get_instance_config", side_effect=NoConfigurationForServiceError()
):
assert (
service_group.get_rules(
DEFAULT_SOA_DIR, firewall.DEFAULT_SYNAPSE_SERVICE_DIR
)
== ()
)
@mock.patch.object(iptables, "ensure_chain", autospec=True)
@mock.patch.object(iptables, "reorder_chain", autospec=True)
def test_service_group_update_rules(reorder_mock, ensure_mock, service_group):
with mock.patch.object(
type(service_group), "get_rules", return_value=mock.sentinel.RULES
):
service_group.update_rules(
DEFAULT_SOA_DIR, firewall.DEFAULT_SYNAPSE_SERVICE_DIR
)
ensure_mock.assert_called_once_with(service_group.chain_name, mock.sentinel.RULES)
reorder_mock.assert_called_once_with(service_group.chain_name)
def test_active_service_groups(mock_service_config, mock_services_running_here):
assert firewall.active_service_groups() == {
firewall.ServiceGroup("example_happyhour", "main"): {
"02:42:a9:fe:00:00",
"02:42:a9:fe:00:01",
},
firewall.ServiceGroup("example_happyhour", "batch"): {"02:42:a9:fe:00:02"},
firewall.ServiceGroup("my_cool_service", "web"): {
"02:42:a9:fe:00:03",
"02:42:a9:fe:00:04",
},
}
def test_ensure_internet_chain():
with mock.patch.object(iptables, "ensure_chain", autospec=True) as m:
firewall._ensure_internet_chain()
(call,) = m.call_args_list
args, _ = call
assert args[0] == "PAASTA-INTERNET"
assert args[1] == (
EMPTY_RULE._replace(target="ACCEPT"),
EMPTY_RULE._replace(dst="127.0.0.0/255.0.0.0", target="RETURN"),
EMPTY_RULE._replace(dst="10.0.0.0/255.0.0.0", target="RETURN"),
EMPTY_RULE._replace(dst="172.16.0.0/255.240.0.0", target="RETURN"),
EMPTY_RULE._replace(dst="192.168.0.0/255.255.0.0", target="RETURN"),
EMPTY_RULE._replace(dst="169.254.0.0/255.255.0.0", target="RETURN"),
)
@mock.patch.object(
firewall, "_nerve_ports_for_service_instance", return_value=[30000, 30001]
)
@mock.patch.object(firewall, "_default_rules", return_value=[])
@mock.patch.object(firewall, "_well_known_rules", return_value=[])
@mock.patch.object(firewall, "_cidr_rules", return_value=[])
def test_reject_inbound_network_traffic(
mock_cidr_rules,
mock_well_known_rules,
mock_default_rules,
mock_get_proxy_port,
mock_service_config,
service_group,
):
mock_service_config.return_value.get_inbound_firewall.return_value = "reject"
assert service_group.get_rules(
DEFAULT_SOA_DIR, firewall.DEFAULT_SYNAPSE_SERVICE_DIR
) == (
EMPTY_RULE._replace(
protocol="tcp",
target="REJECT",
src="0.0.0.0/0.0.0.0",
dst="0.0.0.0/0.0.0.0",
matches=(("tcp", (("dport", ("30000",)),)),),
target_parameters=((("reject-with", ("icmp-port-unreachable",))),),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
src="127.0.0.0/255.0.0.0",
dst="0.0.0.0/0.0.0.0",
matches=(("tcp", (("dport", ("30000",)),)),),
target_parameters=(),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
src="169.254.0.0/255.255.0.0",
dst="0.0.0.0/0.0.0.0",
matches=(("tcp", (("dport", ("30000",)),)),),
target_parameters=(),
),
EMPTY_RULE._replace(
protocol="tcp",
target="REJECT",
src="0.0.0.0/0.0.0.0",
dst="0.0.0.0/0.0.0.0",
matches=(("tcp", (("dport", ("30001",)),)),),
target_parameters=((("reject-with", ("icmp-port-unreachable",))),),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
src="127.0.0.0/255.0.0.0",
dst="0.0.0.0/0.0.0.0",
matches=(("tcp", (("dport", ("30001",)),)),),
target_parameters=(),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
src="169.254.0.0/255.255.0.0",
dst="0.0.0.0/0.0.0.0",
matches=(("tcp", (("dport", ("30001",)),)),),
target_parameters=(),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="1.2.3.4/255.255.255.255",
matches=(
("comment", (("comment", ("backend example_happyhour.main",)),)),
("tcp", (("dport", ("123",)),)),
),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="5.6.7.8/255.255.255.255",
matches=(
("comment", (("comment", ("backend example_happyhour.main",)),)),
("tcp", (("dport", ("567",)),)),
),
),
EMPTY_RULE._replace(
protocol="tcp",
target="ACCEPT",
dst="169.254.255.254/255.255.255.255",
matches=(
("comment", (("comment", ("proxy_port example_happyhour.main",)),)),
("tcp", (("dport", ("20000",)),)),
),
),
)
@pytest.fixture
def mock_active_service_groups():
groups = {
firewall.ServiceGroup("cool_service", "main"): {
"02:42:a9:fe:00:02",
"fe:a3:a3:da:2d:51",
"fe:a3:a3:da:2d:50",
},
firewall.ServiceGroup("cool_service", "main"): {"fe:a3:a3:da:2d:40"},
firewall.ServiceGroup("dumb_service", "other"): {
"fe:a3:a3:da:2d:30",
"fe:a3:a3:da:2d:31",
},
}
return groups
@mock.patch.object(iptables, "reorder_chain", autospec=True)
def test_ensure_service_chains(
mock_reorder_chain, mock_active_service_groups, mock_service_config
):
with mock.patch.object(iptables, "ensure_chain", autospec=True) as m:
assert firewall.ensure_service_chains(
mock_active_service_groups,
DEFAULT_SOA_DIR,
firewall.DEFAULT_SYNAPSE_SERVICE_DIR,
) == {
"PAASTA.cool_servi.397dba3c1f": {"fe:a3:a3:da:2d:40"},
"PAASTA.dumb_servi.8fb64b4f63": {"fe:a3:a3:da:2d:30", "fe:a3:a3:da:2d:31"},
}
assert len(m.mock_calls) == 2
assert mock.call("PAASTA.cool_servi.397dba3c1f", mock.ANY) in m.mock_calls
assert mock.call("PAASTA.dumb_servi.8fb64b4f63", mock.ANY) in m.mock_calls
assert mock.call("PAASTA.cool_servi.397dba3c1f") in mock_reorder_chain.mock_calls
assert mock.call("PAASTA.dumb_servi.8fb64b4f63") in mock_reorder_chain.mock_calls
def test_ensure_dispatch_chains():
with mock.patch.object(
iptables, "ensure_rule", autospec=True
) as mock_ensure_rule, mock.patch.object(
iptables, "ensure_chain", autospec=True
) as mock_ensure_chain:
firewall.ensure_dispatch_chains(
{"chain1": {"mac1", "mac2"}, "chain2": {"mac3"}}
)
assert mock_ensure_chain.mock_calls == [
mock.call(
"PAASTA",
{
EMPTY_RULE._replace(
target="chain1", matches=(("mac", (("mac-source", ("MAC1",)),)),)
),
EMPTY_RULE._replace(
target="chain1", matches=(("mac", (("mac-source", ("MAC2",)),)),)
),
EMPTY_RULE._replace(
target="chain2", matches=(("mac", (("mac-source", ("MAC3",)),)),)
),
},
)
]
assert mock_ensure_rule.mock_calls == [
mock.call("INPUT", EMPTY_RULE._replace(target="PAASTA")),
mock.call("FORWARD", EMPTY_RULE._replace(target="PAASTA")),
]
def test_garbage_collect_old_service_chains():
with mock.patch.object(
iptables, "delete_chain", autospec=True
) as mock_delete_chain, mock.patch.object(
iptables,
"all_chains",
autospec=True,
return_value={
"INPUT",
"OUTPUT",
"FORWARD",
"DOCKER",
"PAASTA",
"PAASTA-INTERNET",
"PAASTA.chain1",
"PAASTA.chain3",
},
):
firewall.garbage_collect_old_service_chains(
{"PAASTA.chain1": {"mac1", "mac2"}, "PAASTA.chain2": {"mac3"}}
)
assert mock_delete_chain.mock_calls == [mock.call("PAASTA.chain3")]
@mock.patch.object(firewall.ServiceGroup, "get_rules", return_value=mock.sentinel.RULES)
@mock.patch.object(iptables, "reorder_chain", autospec=True)
@mock.patch.object(iptables, "ensure_chain", autospec=True)
@mock.patch.object(iptables, "insert_rule", autospec=True)
def test_prepare_new_container(
insert_rule_mock, ensure_chain_mock, reorder_chain_mock, get_rules_mock
):
firewall.prepare_new_container(
DEFAULT_SOA_DIR,
firewall.DEFAULT_SYNAPSE_SERVICE_DIR,
"myservice",
"myinstance",
"00:00:00:00:00:00",
)
assert ensure_chain_mock.mock_calls == [
mock.call("PAASTA-DNS", mock.ANY),
mock.call("PAASTA-INTERNET", mock.ANY),
mock.call("PAASTA-COMMON", mock.ANY),
mock.call("PAASTA.myservice.7e8522249a", mock.sentinel.RULES),
]
assert reorder_chain_mock.mock_calls == [mock.call("PAASTA.myservice.7e8522249a")]
assert insert_rule_mock.mock_calls == [
mock.call(
"PAASTA",
EMPTY_RULE._replace(
target="PAASTA.myservice.7e8522249a",
matches=(("mac", (("mac-source", ("00:00:00:00:00:00",)),)),),
),
)
]
@pytest.mark.parametrize(
("resolv_conf", "expected"),
(
(
"nameserver 8.8.8.8\n"
"nameserver\t8.8.4.4\n"
"nameserver 169.254.255.254\n",
("8.8.8.8", "8.8.4.4", "169.254.255.254"),
),
(
"#nameserver 8.8.8.8\n"
"nameserver\n"
"nameserver 8.8.4.4\n"
"nameserver 2001:4860:4860::8888\n",
("8.8.4.4",),
),
(
"domain yelpcorp.com\n" "nameserver 8.8.4.4\n" "search a b c d\n",
("8.8.4.4",),
),
),
)
def test_dns_servers(tmpdir, resolv_conf, expected):
path = tmpdir.join("resolv.conf")
path.write(resolv_conf)
with mock.patch.object(firewall, "RESOLV_CONF", path.strpath):
assert tuple(firewall._dns_servers()) == expected
def test_ensure_dns_chain(tmpdir):
path = tmpdir.join("resolv.conf")
path.write("nameserver 8.8.8.8\n" "nameserver 8.8.4.4\n")
with mock.patch.object(
iptables, "ensure_chain", autospec=True
) as m, mock.patch.object(firewall, "RESOLV_CONF", path.strpath):
firewall._ensure_dns_chain()
(call,) = m.call_args_list
args, _ = call
assert args[0] == "PAASTA-DNS"
assert args[1] == (
EMPTY_RULE._replace(
dst="8.8.8.8/255.255.255.255",
target="ACCEPT",
protocol="udp",
matches=(("udp", (("dport", ("53",)),)),),
),
EMPTY_RULE._replace(
dst="8.8.8.8/255.255.255.255",
target="ACCEPT",
protocol="tcp",
matches=(("tcp", (("dport", ("53",)),)),),
),
EMPTY_RULE._replace(
dst="8.8.4.4/255.255.255.255",
target="ACCEPT",
protocol="udp",
matches=(("udp", (("dport", ("53",)),)),),
),
EMPTY_RULE._replace(
dst="8.8.4.4/255.255.255.255",
target="ACCEPT",
protocol="tcp",
matches=(("tcp", (("dport", ("53",)),)),),
),
)
def test_ensure_common_chain():
with mock.patch.object(iptables, "ensure_chain", autospec=True) as m:
firewall._ensure_common_chain()
(call,) = m.call_args_list
args, _ = call
assert args[0] == "PAASTA-COMMON"
assert args[1] == (
EMPTY_RULE._replace(
target="ACCEPT", matches=(("conntrack", (("ctstate", ("ESTABLISHED",)),)),)
),
EMPTY_RULE._replace(
dst="169.254.255.254/255.255.255.255",
target="ACCEPT",
protocol="tcp",
matches=(
("comment", (("comment", ("scribed",)),)),
("tcp", (("dport", ("1463",)),)),
),
),
EMPTY_RULE._replace(
dst="169.254.255.254/255.255.255.255",
target="ACCEPT",
protocol="udp",
matches=(
("comment", (("comment", ("metrics-relay",)),)),
("udp", (("dport", ("8125",)),)),
),
),
EMPTY_RULE._replace(
dst="169.254.255.254/255.255.255.255",
target="ACCEPT",
protocol="tcp",
matches=(
("comment", (("comment", ("sensu",)),)),
("tcp", (("dport", ("3030",)),)),
),
),
EMPTY_RULE._replace(target="PAASTA-DNS"),
)